An investigative hearing exploring the deadly Asiana Airlines crash in San Francisco earlier this year has been postponed again, this time because of wintry weather in Washington, D.C.

The National Transporation Safety Board had already postponed the hearing from November to December because of the partial government shutdown. The hearing, rescheduled for Tuesday, has now been postponed a second time, with the NTSB citing inclement weather in the area as the reason.

A winter storm blanketed the D.C. region Tuesday with a layer of several inches of snow, prompting schools and many federal government offices to close for the day.

[Updated 11:43 a.m. PST, Dec. 10, 2013: The NTSB announced that the hearing has been resecheduled for Wednesday from 8:30 a.m. to 8 p.m.]

Asiana Airlines Flight 214 clipped a seawall on July 6 and slammed into a runway while landing at San Francisco International Airport.

Three teenage girls were killed in the crash and more than 180 other people were injured. One of the passengers who died was struck by an emergency vehicle on its way to the crash site.

The tragedy has raised questions about the training and skills of Asiana's pilots, government oversight in South Korea and automated flight systems, which the crew was relying on during the landing.

Asiana officials have said they plan to overhaul the airline's safety procedures, but no specifics have been offered.